Resistance.



W. R. YOUMANS.

RESISTANCE.

APPLICATION FILED 00121, 1909. 1,065,015, Patented June 17,1913.

f v gi lvitmcaoco m 71 /?7 WW 61 f roa /11mg UNITED STATES PATENTOFFICE.

WILLIAM R. YOUMANS, OF COLUMBUS, OHIO, ASSIGNOR 1'0 THE JEFFREYIIANUFAC- TUBING COMPANY, A CORPORATION OF OHIO.

RESISTANCE.

Specification of Letters Patent.

Patented June 1 7, 1913.

1 b all whom it may concern Be it known that I, WILLIAM R. YonMANs,

a citizen of the United States, residing at Columbus, in the county ofFranklin and State of Ohio, have invented certain new and usefulImprovements in Resistances, of which the following is a specification,reference being had therein to the accompanying drawing.

resistances. One of its objects is to provide a light and compactconstruction which shall have a high resistance and large heat radiatingcapacity.

A further object is to rovide improved means for tensioning the eeinents of the resistance.

In the accompanying drawings I have shown one embodiment of myinvention, but it will be understood that various structural changes maybe made within the scope of my invention.

In the drawings Figure 1 is a side elevation, Fig. 2 is a vertical crosssection taken along the line 2-2 of Fig. 1, and Fig. 3 is a plan View. i

Referring to the drawings, 1 represents the main frame. This comprisesthe two side rods 2, 2 and the end angle irons 33.

4 are spacer blocks through which the side rods 2, 2 pass and to whichtheyare secured by means of the nuts. The angle irons are riveted to thespacer blocks 4, and in this way the spacer blocks unite the angle ironsand the side rods into a rigid rectangular frame. 5, 5 are angle ironssimilar to 33.

These are secured together and to the side rods 2, 2 bymeans of spacerblocks similar to the blocks 4, 4. The springs 6, 6 engage the angleirons 5, 5 and tend to force them outward. The pressure of the springsmay be adjusted by turning the nuts 7, 7.

Between the upper pair of angle irons 3, 3, and between the angle irons5, 5, I mount a series of rollers 88. These are supported by the bolts99 which extend between the angle irons. The rollers 88 are constructedof wood or other suitable insulating material. Over these rollersislaced the ribbon 10 which extends alternately from a roller on one endto a roller on the other. The rollers 8 are provided with side flanges.which prevent contact between the ribbon and the frame.

The ribbon 10 is composed of any suitable alloy which has a highspecific resistance and is capable of withstandin a high temperature.The ends of the rib on are secured to the terminal blocks 11 which aremounted between the angle irons 3. 3. To these terminal blocks areconnected the lead wires 12, 12.

The elastic mounting of the frame section I comprising the angle irons5, 5, permits ex-- Ilns invention relates to improvements in pansion andcontraction of the ribbon 10, and at the same time maintains it inproper tension. With this construction it is 1mposslble for two parts ofthe ribbon to expand and become short circuited by engaging one another.The use of the rollers distributes the tension uniformly throughout thevarious, parts of the ribbon, and also gives a direct and positiveconnection between all parts, Which would not be the case were theresistance to be composed of a number of separate strips connectedtogether.

While I have described the resistance element 10 as a ribbon, I do notdesire to limit myself to this exact construction. In some cases it maybe preferable to use a circular wire, or even a number of parallelcircular wires.

WVhat I claim is 1. In a resistance device, the combination of twoparallel frame parts, resilient means tending to hold the-said parts insubstantial.

parallelism and to force one of said parts away from the other, twoparallel series of rotatable rollers, one on each of the said frameparts, the axis of each roller being perpendicular to the correspondingframe part and a continuous flexible resistance ele ment extending overthe said rollers and back and forth between the said two frame parts,substantially as set forth.

2. In a resistance device, the combination of two frame parts, each partconsisting of two parallel connected bars, resilient means tending toforce the two parts away from one another, a series of insulated flangedrollers rotatably mounted between the bars comprising one frame part, asecond series of insulated flanged rollers rotatably mounted between thebars comprising the second frame part, and a continuous flexibleresistance element extending over said rollers and in a zigzag mannerbetween the two frame parts, substantially as set forth.

3. In a resistance'device, the combination of three parallel frame-partslying in the same plane, rigid connecting membirs between the outer twoof the said frame parts, the middle of the said frame parts beingslidable on the connecting members, resist-- ance element-s between themiddle frame part and one of the end frame parts, and means for movingthe tension the resistance elements, substantially as set forth.

4. In a resistance device, the combination of three frame elements eachcomprising two parallel connected bars, connecting rods between theouter two of the said frame elements, the middle of the said elementsbeing slidable on the bars, a series of insulated flanged rollersbetween the bars comprising one of the outer frame elements, a secondseries of insulated flanged rollers between the bars comprising themiddle frame element, a continuous flexible resistance element extendingover said rollers and back and forth between the two series, andresilient means for forcing the middle frame element in one direction totension the resistance element, substantially as set forth.

middle frame part to' of two stationary frame parts, two tie-boltsrigidly connecting the said stationary frame parts, a movable frame partbetween the tw0 stationary frame parts and slidably en- ,gagmg the saidtie-bolts, a series of insulating rollers rotatably mounted upon one ofthe stationary frame parts, a similar series of insulating rollersrotatably mounted upon the movable frame part, a continuous fiexibleresistance element extending over said rollers in a zigzag mannerbetween the two frame parts, nuts in adjustable threaded engagement withthe tie-bolts, and coil springs on the tie-bolts between the said. nutsand the said movable frame parts, the said springs tending to move themovable frame part to tension the said resistance element, substantiallyas set forth.

In testimony whereof I afiix my signature, in presence of two witnesses.

' WM. R. YOUMANS.

Witnesses:

ARTHUR G. SKEELs, R. R. DUNLor.

